The answer, like all the great mysteries of our time, can be solved on Twitter.

The "Transformers" star took to Twitter, posting several emails exchanged with his fellow "Orphans" collaborators, according to Playbill.

A Feb. 19 email from Sullivan, titled "creative differences," supposedly said, "I'm too old for disagreeable situations. you're one hell of a great actor. Alec is who he is. you are who you are. you two are incompatible. I should have known it. this one will haunt me. you tried to warn me. you said you were a different breed. I didn't get it. Dan"

Fox News reported that LaBeouf sent an email to Baldwin that read, in part, "Alec, I'm sorry for my part of a disagreeable situation."

Then he posted an email to him signed "AB" (Alec Baldwin?):

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"SL I've been through this before. It's been a while. And perhaps some of the particulars are different. But it comes down to the fact that what we all do now is critical. Perhaps especially for you. When the change comes, how do we handle it, whether it be good or bad? What do we learn? I don't have an unkind word to say about you. You have my word. AB"

To which LaBeouf responds, "same. ... good luck on the play. you'll be great."

Doubtless, we'll be hearing more about this.

"Orphans" is a revival of Lyle Kessler's 1993 play about two orphaned brothers who kidnap a man. It is scheduled to begin previews March 19. The New York Times reported Thursday that Ben Foster ("3:10 to Yuma," "The Messenger") will replace LaBeouf.